Quake III: Team Arena

One of the clans in Quake III: Team Arena, The Strogg, is also an alien race in the Quake universe; they are the main enemy in Quake II and Quake 4. The names of three members of the clan, Enforcer, Icarus and Paracyte are also the names of three enemies in Quake II (the last one is called Parasite there).